# Relationship history for MSHA mine 4105268

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Southwest, LLC → Liberty Ranch**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Martin Marietta Materials Inc → Liberty Ranch; 2007-11-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Norvarem S A U → Liberty Ranch; 2010-10-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Crushed Concrete LLC → Liberty Ranch; 2017-06-13 to 2021-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Norvarem S A U → Southern Crushed Concrete LLC; 2017-06-13 to 2021-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Southwest, LLC → Liberty Ranch; 2021-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Southwest, LLC; 2021-08-11 to current/open; source msha-controller-operator-history